use -Wunused-parameter with gcc for consistency with MSVC and other compilers which warn about this; fix the uncovered warnings in wxGTK

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49376 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/animate.h

@@ -44,7 +44,7 @@ public:
 
     // we can retrieve the delay for a frame only after building
     // a GdkPixbufAnimationIter...
-    virtual int GetDelay(unsigned int frame) const { return 0; }
+    virtual int GetDelay(unsigned int WXUNUSED(frame)) const { return 0; }
 
     virtual wxSize GetSize() const;
 

include/wx/gtk/dcscreen.h

@@ -33,21 +33,21 @@ public:
 
     ~wxGTKScreenImplDC();
 
-    static bool StartDrawingOnTop( wxWindow *window ) { return true; }
-    static bool StartDrawingOnTop( wxRect *rect = (wxRect *) NULL ) { return true; }
+    static bool StartDrawingOnTop(wxWindow * WXUNUSED(window))
+        { return true; }
+    static bool StartDrawingOnTop(wxRect * WXUNUSED(rect) =  NULL)
+        { return true; }
     static bool EndDrawingOnTop() { return true; }
 
 
 protected:
     virtual void DoGetSize(int *width, int *height) const;
-    
+
     void Init();
 
 private:
     DECLARE_ABSTRACT_CLASS(wxGTKScreenImplDC)
 };
 
-#endif
-
-    // __GTKDCSCREENH__
+#endif // __GTKDCSCREENH__
 

include/wx/gtk/filepicker.h

@@ -49,7 +49,8 @@
     /* so, override wxButton::GTKGetWindow and return NULL as GTK+ doesn't */ \
     /* give us access to the internal GdkWindow of a GtkFileChooserButton  */ \
 protected:                                                                    \
-    virtual GdkWindow *GTKGetWindow(wxArrayGdkWindows& windows) const         \
+    virtual GdkWindow *                                                       \
+    GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const                  \
         { return NULL; }